diff --git a/crates/oxide_compiler/tests/compile_expr_tests.rs b/crates/oxide_compiler/tests/compile_expr_tests.rs
index fead3e8..3f708c3 100644
--- a/crates/oxide_compiler/tests/compile_expr_tests.rs
+++ b/crates/oxide_compiler/tests/compile_expr_tests.rs
@@ -565,7 +565,7 @@ fn compile_class_expression_emits_constructor_value() {
         module
             .bytecode
             .iter()
-            .filter(|&&i| opcode::opcode(i) == OpCode::SET_PROP)
+            .filter(|&&i| opcode::opcode(i) == OpCode::DEFINE_PROP_ATTRS)
             .count()
             >= 3,
         "class expression should wire method/constructor/prototype properties"
@@ -594,7 +594,9 @@ fn compile_large_pure_expression_reuses_temp_registers() {
 
 #[test]
 fn compile_builtin_globals_are_registered_lazily() {
-    let module = compile_source("Object; Array; Math; JSON");
+    // 数组字面量内全部 4 个引用均为活代码（结果即脚本值），DCE 不可删；
+    // 未被引用的其它内置全局不得占用槽位。
+    let module = compile_source("[Object, Array, Math, JSON]");
     assert_eq!(module.builtin_reg_map.len(), 4, "only referenced builtins should allocate registers");
 }
 
diff --git a/crates/oxide_compiler/tests/compile_stmt_tests.rs b/crates/oxide_compiler/tests/compile_stmt_tests.rs
index 8c0ed02..47ce4ea 100644
--- a/crates/oxide_compiler/tests/compile_stmt_tests.rs
+++ b/crates/oxide_compiler/tests/compile_stmt_tests.rs
@@ -277,7 +277,7 @@ fn compile_class_declaration_emits_constructor_and_prototype_setup() {
         module
             .bytecode
             .iter()
-            .filter(|&&i| opcode::opcode(i) == OpCode::SET_PROP)
+            .filter(|&&i| opcode::opcode(i) == OpCode::DEFINE_PROP_ATTRS)
             .count()
             >= 3,
         "class should assign method, constructor, and prototype properties"
@@ -304,8 +304,11 @@ fn compile_class_declaration_default_constructor_creates_submodule() {
 fn compile_class_instance_getter_emits_define_accessor() {
     let module = compile_source("class A { get x() { return 1; } }");
     assert!(
-        module.bytecode.iter().any(|&i| opcode::opcode(i) == OpCode::DEFINE_ACCESSOR),
-        "class getter should emit DEFINE_ACCESSOR"
+        module
+            .bytecode
+            .iter()
+            .any(|&i| opcode::opcode(i) == OpCode::DEFINE_ACCESSOR_ATTRS),
+        "class getter should emit DEFINE_ACCESSOR_ATTRS"
     );
 }
 
@@ -313,8 +316,11 @@ fn compile_class_instance_getter_emits_define_accessor() {
 fn compile_class_static_setter_emits_define_accessor() {
     let module = compile_source("class A { static set x(v) { this.y = v; } }");
     assert!(
-        module.bytecode.iter().any(|&i| opcode::opcode(i) == OpCode::DEFINE_ACCESSOR),
-        "static class setter should emit DEFINE_ACCESSOR"
+        module
+            .bytecode
+            .iter()
+            .any(|&i| opcode::opcode(i) == OpCode::DEFINE_ACCESSOR_ATTRS),
+        "static class setter should emit DEFINE_ACCESSOR_ATTRS"
     );
 }